/* 首屏加载loading */
<template>
  <div v-if="loading" class="loading-page">
    <div id="sky">
      <div class="bird">
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="wind"></div>
        <div class="bird_body">
          <div class="bird_head"></div>
          <div class="bird_wing_left">
            <div class="bird_wing_left_top"></div>
          </div>
          <div class="bird_wing_right">
            <div class="bird_wing_right_top"></div>
          </div>
          <div class="bird_tail_left"></div>
          <div class="bird_tail_right"></div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data: () => ({
    loading: false,
  }),
  methods: {
    start() {
      this.loading = true
    },
    finish() {
      this.loading = false
    },
  },
}
</script>

<style scoped>
.loading-page {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #eef;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 999999;
}
#sky {
  margin-top: -60px;
  perspective: 400px;
  filter: drop-shadow(0px 150px 10px rgba(0, 0, 0, 0.2));
}
@-moz-document url-prefix() {
  #sky {
    filter: none;
  }
}
#sky div {
  transform-style: preserve-3d;
}
#sky .bird {
  -webkit-animation: fly 10000ms linear infinite;
  animation: fly 10000ms linear infinite;
}
#sky .bird .wind {
  position: absolute;
  left: 50%;
  width: 4px;
  height: 200px;
  margin-left: -2px;
  border-radius: 999px;
  overflow: hidden;
}
#sky .bird .wind:nth-child(1) {
  transform: translate3d(189px, -97px, 82px) rotateY(90deg);
}
#sky .bird .wind:nth-child(1)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 207, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 2331ms 1268ms linear infinite;
  animation: wind 2331ms 1268ms linear infinite;
}
#sky .bird .wind:nth-child(2) {
  transform: translate3d(132px, 5px, 70px) rotateY(90deg);
}
#sky .bird .wind:nth-child(2)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 254, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 2438ms 1537ms linear infinite;
  animation: wind 2438ms 1537ms linear infinite;
}
#sky .bird .wind:nth-child(3) {
  transform: translate3d(65px, -132px, -5px) rotateY(90deg);
}
#sky .bird .wind:nth-child(3)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 17, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 2613ms 2531ms linear infinite;
  animation: wind 2613ms 2531ms linear infinite;
}
#sky .bird .wind:nth-child(4) {
  transform: translate3d(-179px, 70px, -25px) rotateY(90deg);
}
#sky .bird .wind:nth-child(4)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 124, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 1421ms 1690ms linear infinite;
  animation: wind 1421ms 1690ms linear infinite;
}
#sky .bird .wind:nth-child(5) {
  transform: translate3d(142px, 66px, -87px) rotateY(90deg);
}
#sky .bird .wind:nth-child(5)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 127, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 1639ms 4788ms linear infinite;
  animation: wind 1639ms 4788ms linear infinite;
}
#sky .bird .wind:nth-child(6) {
  transform: translate3d(56px, -66px, -72px) rotateY(90deg);
}
#sky .bird .wind:nth-child(6)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 147, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 1856ms 1426ms linear infinite;
  animation: wind 1856ms 1426ms linear infinite;
}
#sky .bird .wind:nth-child(7) {
  transform: translate3d(183px, 92px, 74px) rotateY(90deg);
}
#sky .bird .wind:nth-child(7)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 31, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 1585ms 3969ms linear infinite;
  animation: wind 1585ms 3969ms linear infinite;
}
#sky .bird .wind:nth-child(8) {
  transform: translate3d(-13px, -33px, 28px) rotateY(90deg);
}
#sky .bird .wind:nth-child(8)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 60, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 1693ms 3611ms linear infinite;
  animation: wind 1693ms 3611ms linear infinite;
}
#sky .bird .wind:nth-child(9) {
  transform: translate3d(-68px, -73px, 88px) rotateY(90deg);
}
#sky .bird .wind:nth-child(9)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 34, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 2249ms 3544ms linear infinite;
  animation: wind 2249ms 3544ms linear infinite;
}
#sky .bird .wind:nth-child(10) {
  transform: translate3d(174px, -74px, 8px) rotateY(90deg);
}
#sky .bird .wind:nth-child(10)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 158, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 1104ms 4095ms linear infinite;
  animation: wind 1104ms 4095ms linear infinite;
}
#sky .bird .wind:nth-child(11) {
  transform: translate3d(-174px, 122px, 20px) rotateY(90deg);
}
#sky .bird .wind:nth-child(11)::before {
  content: '';
  position: absolute;
  width: 4px;
  height: 300px;
  background: rgba(100, 200, 116, 0.3);
  border-radius: 999px;
  transform: translateY(-300px);
  -webkit-animation: wind 1100ms 2546ms linear infinite;
  animation: wind 1100ms 2546ms linear infinite;
}
#sky .bird_body {
  position: relative;
  width: 30px;
  height: 40px;
  background: #70addd;
}
#sky .bird_head {
  position: absolute;
  top: -30px;
  border-right: 15px solid transparent;
  border-bottom: 30px solid #6b83fa;
  border-left: 15px solid transparent;
  transform-origin: 50% 100%;
  transform: rotateX(-20deg);
}
#sky .bird_wing_left {
  position: absolute;
  left: -30px;
  height: 30px;
  border-right: 30px solid #a399d1;
  border-bottom: 10px solid transparent;
  transform-origin: 100% 0;
  -webkit-animation: wingLeft 1000ms cubic-bezier(0.36, 0.1, 0.16, 1) infinite
    alternate;
  animation: wingLeft 1000ms cubic-bezier(0.36, 0.1, 0.16, 1) infinite alternate;
}
#sky .bird_wing_left_top {
  position: absolute;
  left: -30px;
  border-right: 30px solid #929ccf;
  border-bottom: 30px solid transparent;
  transform-origin: 100% 0;
  -webkit-animation: wingLeft 1000ms cubic-bezier(0.545, 0.08, 0.52, 0.975)
    infinite alternate;
  animation: wingLeft 1000ms cubic-bezier(0.545, 0.08, 0.52, 0.975) infinite
    alternate;
}
#sky .bird_wing_right {
  position: absolute;
  left: 30px;
  height: 30px;
  border-left: 30px solid #8567f0;
  border-bottom: 10px solid transparent;
  transform-origin: 0 0;
  -webkit-animation: wingRight 1000ms cubic-bezier(0.36, 0.1, 0.16, 1) infinite
    alternate;
  animation: wingRight 1000ms cubic-bezier(0.36, 0.1, 0.16, 1) infinite
    alternate;
}
#sky .bird_wing_right_top {
  position: absolute;
  border-left: 30px solid #c0a9e0;
  border-bottom: 30px solid transparent;
  transform-origin: 0 0;
  -webkit-animation: wingRight 1000ms cubic-bezier(0.545, 0.08, 0.52, 0.975)
    infinite alternate;
  animation: wingRight 1000ms cubic-bezier(0.545, 0.08, 0.52, 0.975) infinite
    alternate;
}
#sky .bird_tail_left {
  position: absolute;
  top: 40px;
  border-right: 30px solid transparent;
  border-top: 40px solid #74a3ff;
  transform-origin: 50% 0;
  transform: rotateX(-20deg);
}
#sky .bird_tail_right {
  position: absolute;
  top: 40px;
  border-left: 30px solid transparent;
  border-top: 40px solid #a3c8ce;
  transform-origin: 50% 0;
  transform: rotateX(-20deg);
}

@-webkit-keyframes fly {
  0% {
    transform: rotateX(-120deg) rotateZ(0deg) rotateX(10deg);
  }
  100% {
    transform: rotateX(-120deg) rotateZ(360deg) rotateX(10deg);
  }
}

@keyframes fly {
  0% {
    transform: rotateX(-120deg) rotateZ(0deg) rotateX(10deg);
  }
  100% {
    transform: rotateX(-120deg) rotateZ(360deg) rotateX(10deg);
  }
}
@-webkit-keyframes wingLeft {
  0% {
    transform: rotateY(-40deg);
  }
  100% {
    transform: rotateY(40deg);
  }
}
@keyframes wingLeft {
  0% {
    transform: rotateY(-40deg);
  }
  100% {
    transform: rotateY(40deg);
  }
}
@-webkit-keyframes wingRight {
  0% {
    transform: rotateY(40deg);
  }
  100% {
    transform: rotateY(-40deg);
  }
}
@keyframes wingRight {
  0% {
    transform: rotateY(40deg);
  }
  100% {
    transform: rotateY(-40deg);
  }
}
@-webkit-keyframes wind {
  0% {
    transform: translateY(-300px);
  }
  100% {
    transform: translateY(200px);
  }
}
@keyframes wind {
  0% {
    transform: translateY(-300px);
  }
  100% {
    transform: translateY(200px);
  }
}
</style>
